Resumen de A generalized height-diameter growth equation for cork oak forests in Spain
Mariola Sánchez González, Isabel Cañellas Rey de Viñas, Gregorio Montero González
A generalized height-diameter equation for cork oak forests in Spain was developed based on data from the Second Spanish Forest Inventory. Nine generalised height-diameter equations were selected as candidate functions to model the height-diameter under cork relationship. All tested functions are non-linear and constrain the height-diameter relationship to pass through (1.30,0). Fitting of the height-diameter equations was done using the least squares method. A performance analysis was made to select the most appropriate model. The Stoffels and Van Soest power equation constraint to pass through the point dominant diameter and dominant height was selected. The validation of the model was done by characterisation of the model error using the PRESS (Prediction Sum of Squares) statistic. In order to avoid unrealistic height predictions, the height-diameter model developed have not to be applied beyond the range that varies from 7.5 to 75 cm of diameter under cork or for stands with values of dominant height higher than 14 m. This height-diameter equation is one of the sub-models of the ALCORNOQUE v1.0, a management oriented growth and yield model for cork oak forest in Spain.
